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<h1 id="developing-a-new-emc-driver">Developing a new EMC Driver<a class="headerlink" href="#developing-a-new-emc-driver" title="Permanent link">&para;</a></h1>
<p>This article demonstrates the implementation of "drivers" for Epsilon's <a href="../../emc">Model Connectivity layer</a>.</p>
<h2 id="yaml-driver">YAML Driver<a class="headerlink" href="#yaml-driver" title="Permanent link">&para;</a></h2>
<p>The following training session recording and deck of slides demonstrate the implementation of <a href="../yaml-emc">Epsilon's YAML driver</a>. The complete source-code is located in <a href="https://github.com/eclipse/epsilon/tree/main/plugins/org.eclipse.epsilon.emc.yaml">Epsilon's Git repository</a>.</p>
<iframe src="https://www.youtube.com/embed/M0nvnhSF6Y0" width="100%" height="485" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" style="border:1px solid #CCC; border-width:1px; margin-bottom:5px; max-width: 100%;" allowfullscreen></iframe>
<div style="margin-bottom:15px"></div>

<iframe src="https://www.slideshare.net/slideshow/embed_code/key/yc9uUXElc1Zbac" width="100%" height="485" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC; border-width:1px; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>
<div style="margin-bottom:15px"></div>

<h2 id="csv-pro-driver">CSV Pro Driver<a class="headerlink" href="#csv-pro-driver" title="Permanent link">&para;</a></h2>
<p>The slides below demonstrate the implementation of an alternative driver for CSV files, located under the <a href="https://github.com/eclipse/epsilon/tree/main/examples/org.eclipse.epsilon.emc.csvpro"><code>examples</code> folder of Epsilon's repository</a>.</p>
<iframe src="//www.slideshare.net/slideshow/embed_code/key/EIOJx3cFZKlcEh" width="100%" height="485" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" style="border:1px solid #CCC; border-width:1px; margin-bottom:5px; max-width: 100%;" allowfullscreen> </iframe>
<div style="margin-bottom:5px"></div>

<h2 id="filesystem-driver">Filesystem Driver<a class="headerlink" href="#filesystem-driver" title="Permanent link">&para;</a></h2>
<p>This is a minimal toy driver where filesystem folders represent types and property files contained in them represent model elements that are their instances. Below is the main class of the driver and the <a href="https://github.com/eclipse/epsilon/blob/main/examples/org.eclipse.epsilon.emc.filesystem">full source code</a> in Epsilon's repository.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:1"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">FilesystemModel.java</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="cm">/*********************************************************************</span>
<span class="cm">* Copyright (c) 2008 The University of York.</span>
<span class="cm">*</span>
<span class="cm">* This program and the accompanying materials are made</span>
<span class="cm">* available under the terms of the Eclipse Public License 2.0</span>
<span class="cm">* which is available at https://www.eclipse.org/legal/epl-2.0/</span>
<span class="cm">*</span>
<span class="cm">* SPDX-License-Identifier: EPL-2.0</span>
<span class="cm">**********************************************************************/</span>
<span class="kn">package</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.emc.filesystem</span><span class="p">;</span>

<span class="kn">import</span><span class="w"> </span><span class="nn">java.io.File</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.ArrayList</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Collection</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.HashMap</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.List</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Map</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.exceptions.EolRuntimeException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.exceptions.models.EolEnumerationValueNotFoundException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.exceptions.models.EolModelElementTypeNotFoundException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.exceptions.models.EolModelLoadingException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.exceptions.models.EolNotInstantiableModelElementTypeException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.execute.introspection.IPropertyGetter</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.execute.introspection.IPropertySetter</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">org.eclipse.epsilon.eol.models.Model</span><span class="p">;</span>


<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">FilesystemModel</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">Model</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="c1">// Map of directories -&gt; files they contain</span>
<span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">File</span><span class="p">,</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">File</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">cache</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">HashMap</span><span class="o">&lt;&gt;</span><span class="p">();</span>

<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="nf">FilesystemModel</span><span class="p">(</span><span class="n">File</span><span class="w"> </span><span class="n">root</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="n">populateCache</span><span class="p">(</span><span class="n">root</span><span class="p">,</span><span class="w"> </span><span class="n">cache</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">hasType</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">type</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">directoryForName</span><span class="p">(</span><span class="n">type</span><span class="p">)</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Collection</span><span class="o">&lt;?&gt;</span><span class="w"> </span><span class="n">getAllOfKind</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">type</span><span class="p">)</span>
<span class="w">            </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolModelElementTypeNotFoundException</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">cache</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="n">directoryForName</span><span class="p">(</span><span class="n">type</span><span class="p">));</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">owns</span><span class="p">(</span><span class="n">Object</span><span class="w"> </span><span class="n">instance</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">File</span><span class="w"> </span><span class="n">directory</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">cache</span><span class="p">.</span><span class="na">keySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">cache</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="n">directory</span><span class="p">).</span><span class="na">contains</span><span class="p">(</span><span class="n">instance</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w">                </span><span class="k">return</span><span class="w"> </span><span class="kc">true</span><span class="p">;</span>
<span class="w">            </span><span class="p">}</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">false</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">IPropertyGetter</span><span class="w"> </span><span class="nf">getPropertyGetter</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">FilesystemModelPropertyGetter</span><span class="p">();</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">IPropertySetter</span><span class="w"> </span><span class="nf">getPropertySetter</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">FilesystemModelPropertySetter</span><span class="p">();</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Collection</span><span class="o">&lt;?&gt;</span><span class="w"> </span><span class="n">getAllOfType</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">type</span><span class="p">)</span>
<span class="w">            </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolModelElementTypeNotFoundException</span><span class="w"> </span><span class="p">{</span>

<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">cache</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="n">directoryForName</span><span class="p">(</span><span class="n">type</span><span class="p">));</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="c1">//TODO: Implement</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">load</span><span class="p">()</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolModelLoadingException</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Object</span><span class="w"> </span><span class="nf">getEnumerationValue</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">enumeration</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">label</span><span class="p">)</span>
<span class="w">            </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolEnumerationValueNotFoundException</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Collection</span><span class="o">&lt;?&gt;</span><span class="w"> </span><span class="n">allContents</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">getTypeNameOf</span><span class="p">(</span><span class="n">Object</span><span class="w"> </span><span class="n">instance</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Object</span><span class="w"> </span><span class="nf">createInstance</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">type</span><span class="p">)</span>
<span class="w">            </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolModelElementTypeNotFoundException</span><span class="p">,</span>
<span class="w">            </span><span class="n">EolNotInstantiableModelElementTypeException</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">Object</span><span class="w"> </span><span class="nf">getElementById</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">id</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">getElementId</span><span class="p">(</span><span class="n">Object</span><span class="w"> </span><span class="n">instance</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">setElementId</span><span class="p">(</span><span class="n">Object</span><span class="w"> </span><span class="n">instance</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">newId</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">deleteElement</span><span class="p">(</span><span class="n">Object</span><span class="w"> </span><span class="n">instance</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">EolRuntimeException</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">isInstantiable</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">type</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">false</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">store</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">location</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">false</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nd">@Override</span>
<span class="w">    </span><span class="kd">public</span><span class="w"> </span><span class="kt">boolean</span><span class="w"> </span><span class="nf">store</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">false</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="n">File</span><span class="w"> </span><span class="nf">directoryForName</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">name</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">File</span><span class="w"> </span><span class="n">directory</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">cache</span><span class="p">.</span><span class="na">keySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">directory</span><span class="p">.</span><span class="na">getName</span><span class="p">().</span><span class="na">equals</span><span class="p">(</span><span class="n">name</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w">                </span><span class="k">return</span><span class="w"> </span><span class="n">directory</span><span class="p">;</span>
<span class="w">            </span><span class="p">}</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="kd">protected</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">populateCache</span><span class="p">(</span><span class="n">File</span><span class="w"> </span><span class="n">file</span><span class="p">,</span><span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">File</span><span class="p">,</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">File</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">cache</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>

<span class="w">        </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">file</span><span class="p">.</span><span class="na">isDirectory</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">            </span><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">File</span><span class="o">&gt;</span><span class="w"> </span><span class="n">files</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">ArrayList</span><span class="o">&lt;&gt;</span><span class="p">();</span>
<span class="w">            </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">File</span><span class="w"> </span><span class="n">child</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">file</span><span class="p">.</span><span class="na">listFiles</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">                </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">child</span><span class="p">.</span><span class="na">isFile</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="n">files</span><span class="p">.</span><span class="na">add</span><span class="p">(</span><span class="n">child</span><span class="p">);</span>
<span class="w">                </span><span class="p">}</span>
<span class="w">                </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w">                    </span><span class="n">populateCache</span><span class="p">(</span><span class="n">child</span><span class="p">,</span><span class="w"> </span><span class="n">cache</span><span class="p">);</span>
<span class="w">                </span><span class="p">}</span>
<span class="w">            </span><span class="p">}</span>
<span class="w">            </span><span class="n">cache</span><span class="p">.</span><span class="na">put</span><span class="p">(</span><span class="n">file</span><span class="p">,</span><span class="w"> </span><span class="n">files</span><span class="p">);</span>
<span class="w">        </span><span class="p">}</span>
<span class="w">    </span><span class="p">}</span>

<span class="p">}</span>
</code></pre></div>
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